Nightclubs Go Gray

We’ve written before about how clean-living Millennials are giving the nightclub industry a hangover. (See: “Where the Wild Things Aren’t.”) As a result, club owners have set their sights on a new crowd: 40- and 50-somethings. Some have embarked on promotions designed to attract nostalgic older patrons: Retroclubnyc’s throwback theme includes Long Islan…